Determining Your Location within the Electronic Books
When you select a topic from the Search tab or from the Index tab, the topic appears in the right frame while the left frame continues to display either the search results or the Index. You can see the relative position of the topic within the table of contents by clicking the Click to Show Browse Buttons... link, and then clicking the Locate button from the electronic books toolbar.
If you have the Contents tab displayed, the title of the current topic is highlighted in the table of contents as you browse through the book.